Hoisting crane



Jan. 19 1926.

o. s. HUBBARD 'HOIS'I'ING CRANE Filed Nov. 20, 1923 INVENTOR WITN E8828 afwfiw ATTORN IV DscarSH Jan. 19, 1926.

WITH ISSEB .O. 5. HUBBARD BOISTING'CRANE 7 Filed Nov. 26, 1923 2 Shuts-Sheet 2 0/1/11? EF /1111711 j llmllllmlmiimlll VENTOR V ATTOINIY Patented Jan. 19, 1926.

UNITED STATES OSCAR S. HUBBARD, 0F FARMLAND, INDIANA.

HOISTING CRANE.

Application filed November 20, 1923. Serial No. 675,875.

To all whom it may concern:

.Be it known that I, OSCAR S. HUBBARD, a citizen of the United States, residing at Farmland, in the county of Randolph and Stateof Indiana, have invented a new and useful Hoisting Crane, of which the following is a specification.

Thisinvention relates to a hoisting crane of a portable type, especially adapted to be mounted on a truck body or the like, and to be used for lifting motor vehicles out of the mud, for handling wrecked vehicles, and for other purposes in connection with the work of an automobile service station.

The general object of the invention is to provide a hoisting device which is simple in its construction, convenient and easy to operate but strong and powerful, and which is provided with improved means for dis connecting the gear in order to quickly wind or unwind the cable when there is no load,

It is also preferable to provide means whereby the crane may be held in stable position on the truck body, but may be easily shifted forwardly or backwardly thereon.

The nature of the invention will be better understood from the following detailed description taken in connection with the accompanying drawings, which illustrate the preferred form of the invention.

In the drawings:

Figure 1 is a side elevation of the invention. 7

Figure 2 is a tion thereof.

Figure 3 is a detail view of the hoistlng gear in position for operation.

Figure 4 is a similar view showing the plan view of the upper porgear disconnected.

Figure 5 is a sectional View on the line 55 of Figure 3.

Figure 6 is a view similar to Figure 5, but showing the gear disconnected.

Figure 7 is a sectional view taken on the line 7--7 of Figure 3.

Figure 8 is a partial front elevation of the frame for supporting hoisting.

The invention is supported upon a frame which includes a pair of front posts 10, and a pair of rear posts 11, the lower ends of the front and rear posts being connected by parallel angle irons 12, which form runners adapted to be guided under tracks or guide ways 13 having overhanging flanges and secured by bolts 14 or otherwise to the floor 15 of the truck body, or other support upon which the crane is mounted. The front posts 10 are vertical and connected by cross braces 16, while the rear posts 11 converge upwardly and are taller than the posts 10 and are connected by cross braces 17. Thus the posts 10 and 11 form supports to which are bolted the rearwardly and upwardly converging beams 18, forming the sides of a triangular boom. The rear ends of the beams 18 are strongly held by a bracket 19, and the supporting frame is strengthened by diagonal braces 20. In order to further strengthen the device, truss rods 21 are se cured at their ends in transverse angle bars 9 22 and 23, extending respectively across the front and rear ends'of the beams 18, and the intermediate portions of the truss rods pass through an angle bar 24, which is supported in spaced relation to the beams 18 by upright posts 25. A

A pulley 26 is journaled in the bracket 19 at the rear or upper ends of the beams 18, and a cable or chain 27 passes over the pulley and through a tackle block 28, and has its end secured to a bracket or clevis 29, mountedon the boom adjacent the pulley 26. The other end of the cable is wound about a drum 30 having trunnions 31 journaled in bearings 32 and 33 mounted on the respective beams 18. A housing 34 extends outwardly from the bearing 33 and encloses a worm gear 35, which is secured to the end of the trunnion or drum shaft 31. The housing 34 may also be supported from the beam 18 by one or more braces 36. The worm gear 35 is adapted to be driven by a worm 37, also enclosed within the housing 34 and secured to the inner end of a shaft 38, which extends rearwardly at one side of the boom in a convenient position to be operated by a hand wheel 39 carried by its rear end. The rear portion of the shaft 38 is journaled in a bearing 40 formed at the end of a bar 41, secured transversely of the posts 11 and strengthened by an upright brace 47. The forward end of the shaft 38 is journaled in an eccentric sleeve or bushing 42, which in turn is rotatable within a bearing 43 formed in the housing 34. The sleeve 42 is provided at its ends with flanges or collars 44 and 45, so that it is positively held against endwise movement in the bearing 43, and the worm 37 is held against endwise movement by the flange 44 and the front side of the housing 34. A handle 46 is secured to the collar 45, so that the eccentric 42 may be rocked within its bearing 43 to connect the worm 37 with the gear 35, as shown in Figure 3, or disconnect it therefrom, as shown in Figure 4.

From the foregoing description it will be understood that the crane is held by its runners 12 in a stable position on the floor of the truck body, and may be easily moved rearwardly within the guideways 13 into osition for operation, or may be moved orwardly into the truck body when not in use. The crane is of strong and rugged construction, andby means of the multiplication of power provided by the tackle block 28 and the worm gearing 35, 37 an enormous force may be exerted by the application of comparatively little force to the hand wheel 39. The worm gear provides means for holding the load against any possible force which may be applied to the cable 27, and yet there is no ratchet or dog to interfere with the free operations of the hand wheel 9 in either direction. In case there is no load, however, and it is desired to adjustthe pulley quickly, the worm 37 and gear may be disconnected simply by a quarter or half rotation of the eccentric a2, by means of the handle 46.

\Vhile I have described the invention with particular reference to its use in connection with automobile service, it will be readily understood that it may also be used in con-- nection with other work where hoisting or pulling devices are used. The invention, therefore, is not limited to the precise structure, or to the adaptations of the same herein shown and described, but various modifications may be made therein without departing from the salient features of the invention as herein claimed. Instead of the hand wheel 29, I may employ a small motor for turning the shaft 38.

\Vhat is claimed is:

A hoisting device comprising a frame ineluding front and rear posts, parallel angle irons connecting the lower ends of the posts and having out-turned flanges constituting runners, a truck bed, parallel tracks secureijl longitudinally to the upper surface of said truck bed and having overhanging flanges beneath which said angle irons are slidable, a. pair of upwardly and rearwardly converging beams secured. to the upper ends of the posts and forming a boom, hoisting tackle carried by the end of the boom, a drum journaled on the forward portions of said beams for winding up the hoisting tackle, a bar secured transversely of the rear posts and projecting to one side of said frame, a brace supporting the projecting portion of said bar from the lower part of the frame, a bearing at the extremity of said projecting portion, a shaft mounted in said bearing and having a hand wheel at its rear end, and means for operatively connecting the front end of said shaft to the drum for rotating the latter to wind up said hoisting tackle.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature.

OSCAR S. HUBBARD. 

